This method takes two mandatory arguments, both Astro::Catalog objects. It returns two Astro::Catalog objects containing Astro::Catalog::Star objects that matched spatially between the two input catalogues. The first returned catalogue contains matched objects from the first input catalogue, and ditto for the second. The Astro::Catalog::Star objects in the returned catalogues are not in the original order, nor do they have the same IDs as in the input catalogues. A matched object has the same ID in the two returned catalogues, allowing for further comparisons between matched objects.

This method uses the Starlink FINDOFF task, which is part of CCDPACK. In order for this method to work it must be able to find FINDOFF. It first looks in the directory pointed to by the CCDPACK_DIR environment variable, then it looks in the Starlink binary files directory pointed to by the Starlink::Config module, with /ccdpack appended. If either of these fail, then this method will croak. See the Starlink::Config module for information on overriding the base Starlink directory for non-standard installations.

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